/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/Widgets/SItemSelector.h
An optional delegate which determines the sorting for sections. If not bound categories will be ordered by the order they're encountered while processing items.
WidgetArgsType & OnCompareSectionsForSorting &40; const FOnCompareSectionsForSorting & InDelegate &41;